Reserved Terms for WordPress

After bringing a world of pain upon myself due to creating a custom taxonomy using “year”, I thought it would be good to make note of those revered terms for WordPress.

Avoiding the following reserved terms is particularly important if you are passing the term through the $_GET or $_POST array. Doing so can cause WordPress to respond with a 404 error without any other hint or explanation.

• attachment
• attachment_id
• author
• author_name
• calendar
• cat
• category
• category__and
• category__in
• category__not_in
• category_name
• comments_per_page
• comments_popup
• customize_messenger_channel
• customized
• cpage
• day
• debug
• error
• exact
• feed
• hour
• link_category
• m
• minute
• monthnum
• more
• name
• nav_menu
• nonce
• nopaging
• offset
• order
• orderby
• p
• page
• page_id
• paged
• pagename
• pb
• perm
• post
• post__in
• post__not_in
• post_format
• post_mime_type
• post_status
• post_tag
• post_type
• posts
• posts_per_archive_page
• posts_per_page
• preview
• robots
• s
• search
• second
• sentence
• showposts
• static
• subpost
• subpost_id
• tag
• tag__and
• tag__in
• tag__not_in
• tag_id
• tag_slug__and
• tag_slug__in
• taxonomy
• tb
• term
• theme
• type
• w
• withcomments
• withoutcomments
• year